1 /*
2 * I/O remap functions for Hexagon
3 *
4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21 #include <linux/io.h>
22 #include <linux/vmalloc.h>
23 #include <linux/mm.h>
24
ioremap_nocache(unsigned long phys_addr,unsigned long size)25 void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
26 {
27 unsigned long last_addr, addr;
28 unsigned long offset = phys_addr & ~PAGE_MASK;
29 struct vm_struct *area;
30
31 pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
32 |(__HEXAGON_C_DEV << 6));
33
34 last_addr = phys_addr + size - 1;
35
36 /* Wrapping not allowed */
37 if (!size || (last_addr < phys_addr))
38 return NULL;
39
40 /* Rounds up to next page size, including whole-page offset */
41 size = PAGE_ALIGN(offset + size);
42
43 area = get_vm_area(size, VM_IOREMAP);
44 addr = (unsigned long)area->addr;
45
46 if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
47 vunmap((void *)addr);
48 return NULL;
49 }
50
51 return (void __iomem *) (offset + addr);
52 }
53
__iounmap(const volatile void __iomem * addr)54 void __iounmap(const volatile void __iomem *addr)
55 {
56 vunmap((void *) ((unsigned long) addr & PAGE_MASK));
57 }
58